Green Screens As Fast As Possible
Techquickie
·Techquickie
·2016-05-06
·
987 words · ~4 min read
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it seems like Hollywood Blockbusters these days are always trying to outdo
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each other to see which film can have the most wildly over-the-top
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multi-million dollar special effects and while this sort of movie Magic can
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require some really complicated postprocessing much of it relies on a
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pretty simple piece of equipment The Humble green screen which allows it to
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appear as though a piece of content was filmed in a completely different
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location be it a Fantastical one or
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totally mundane one but how does it work
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well when you shoot something in front of a green screen such as your favorite
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YouTube host you can tell Whatever video
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editing software you're using to detect a range of colors in this case shades of
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green and replace anything that falls within that range with a transparent
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layer that means you can put anything you want behind it and it will peep
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through and although this is a pretty simple idea green screens have proved to
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be extremely versatile and are widely used to Overlay even extremely complex
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and expensive CGI in high budget films
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now part of the reason for this is how useful the color green is modern digital
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video cameras use things called Bayer filters to capture light these filters
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are designed to be more sensitive to Green Light than to red or blue because
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our own eyes operate the same way way and are most responsive to Green this
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allows the camera to record many shades of green very accurately so that when
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the raw footage is edited on a computer the software can precisely replace only
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green pixels and leave everything else intact green also contrasts very well
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with human skin color unless your name is Bruce Banner making it an ideal
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choice for use in a studio but green screens weren't always the most commonly
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used background for special effects before the Advent of modern digital
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recording blue screens no not that kind
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were actually more popular you see back in the era of the physical film real
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special film that was only sensitive to Blue Light was readily available making
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it easy to produce a negative that came out clear where the blue screen was
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which could then be overlaid with a background to produce a full scene blue
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screens were used extensively in Classic Movies such as the original Star Wars
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Trilogy Where producers filmed miniature models of Starships in front of blue
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backgrounds and they continue to be used today in certain situations such as
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shooting low light scenes so wait a minute lonus are you telling me that all
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I need to create awesome scenes at home is a camera an editing rig and a big
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green or a blue sheet well sort of
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before you whip out the camera and try to give James camera to run for his
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money there are a couple of things to keep in mind if you're shooting with the
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green screen although modern video editing software is very good at
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differentiating Shades of Green from other colors shadows and shiny surfaces
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can absorb or reflect enough green light to throw off your software and make the
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finished product look like a mess for this reason proper lighting is extremely
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important to professionals who make a living off of green screen recordings
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but are YouTubers like me going to be using green screens forever we are
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starting to see cameras that can actually record depth information kind
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of like the connect for Xbox so the future could be very interesting but for
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professional cinematographers instead of casual gamers this technology is very
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very far away from mature so for the foreseeable future you won't be
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expecting to see me wear any green shirts on St Patrick's Day so let's say
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